title: All-fiber optical filter with an ultranarrow and rectangular spectral response.
abstract: Optical filters with an ultranarrow and rectangular spectral response are highly desired for high-resolution optical/electrical signal processing. An all-fiber optical filter based on a fiber Bragg grating with a large number of phase shifts is designed and fabricated. The measured spectral response shows a 3 dB bandwidth of 650 MHz and a rectangular shape factor of 0.513 at the 25 dB bandwidth. This is the narrowest rectangular bandpass response ever reported for an all-fiber filter, to the best of our knowledge. The filter has also the intrinsic advantages of an all-fiber implementation.
authors.forename: Xihua
authors.initials: X
authors.lastname: Zou
authors.forename: Ming
authors.initials: M
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Pan
authors.forename: Lianshan
authors.initials: L
authors.lastname: Yan
authors.forename: José
authors.initials: J
authors.lastname: Azaña
authors.forename: Jianping
authors.initials: J
authors.lastname: Yao